Research purposes: This paper takes the CWR track system of ballastless track on a long-span continuous beam bridge of a sea-crossing railway bridge as the research object, carries out research on the structural force and deformation law, and proposes (60+37×80 +60) m continuous beam bridge laying plan for CWR track of ballastless track, installation plan of rail expansion joints,analyzes the dynamic performance of the CWR track on the bridge, and puts forward maintenance and repair recommendations.
Research conclusions: (1) On (60+37×80+60) m continuous beam bridges, rail expansion joints must be installed when constant and small resistance fastenings are used; (2) When the train passes through the main bridge area at 350 km/h, the vibration characteristic indexes of the track and bridge structure and the vehicle driving characteristic indexes meet the requirements of the specification; (3) In the area affected by the rail expansion joints, the wheel-rail vertical force and the reduction rate of wheel load are significantly increased; (4) In combination with accidental load factors such as earthquakes, wind and waves, it is suggested to select the rail expansion joints with ultra-large range and girder end expansion device, strengthen the on-line monitoring and scientific maintenance of track condition in the rail expansion joint area of concrete continuous beam;(5) The research conclusions can be used to guide the design and construction of CWR track of long-span continuous beam of sea-crossing railway bridge.
Key words
sea-crossing bridge /
long-connected large-span /
continuous beam /
CWR track /
dynamic performance
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References
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